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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e6ee2339adaef74b7709d0bc64ce121ab88305502eaf268f024ef5165d29894' 
  AND token = 'tQGyJne0WUQxnPoXU0HJYEWwkbE+lXXSu1w/J652cqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}