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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1d2c19afc56cd63867ec2898d5285b3ea27a02bd6a1c8be83fad638607b7eea' 
  AND token = 'xkLZIf7Y5hnqsc6Q0qJggvswvYREvRgc6SWrdjKEZbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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