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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b724edc7812243baa1f55b512d353b2ea10beb73690d97dbaaa1c818e7fc1e55' 
  AND token = 'f4bffCL6aS3hue9sI3y3jBK4GyPx5VVoReAU06K2HoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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