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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b599eaced34f57393804c1854ecef6ad483ad8d22991037aaba5ae2a71fd80d6' 
  AND token = 'g886vVrzZyEN8o7vaaFCJvs3qrjtcWS2fkLh3k8U2hU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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