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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47a4a75d56d56cb837bcf43a54aa3df030868cae55c787fe3649b6e0aba72a3c' 
  AND token = 'ho4Wpn7u6k7LggXnGzZNFksRLvQqree8VFPjrE0UwdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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