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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4d939856621bb31434f3e41d5d3d370b373c019b45e36fe9e6cd0ed0713915c' 
  AND token = '3dkRosheDtbYnEFCFzn2qpmmChLOw6W3G9/rZ/QvhLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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