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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '293c13aa7f6e9772ce6539a113c20448aa0f5f75652b5077b0546403334138ea' 
  AND token = 'e681Y/8j3N8+txMwTC8wCabgxyenQubZA8JRRWdNyWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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