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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc61873dd5eb5114dbfba8d2d56133241c1f87bf7e96caeb88dd3b5ba64837ea' 
  AND token = 'esAmXY5zjWTqLfMry3tybBPjJvX/wpvVNna73JA6idk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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