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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bce108315c8cf65a399dad12d6e13b28d732cceee76182935ba02539e0a957c9' 
  AND token = 'K9aC/tNHZkWjkWxEUgSzMRQ8K/WPNkEsTvmWDEVeNq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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