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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c44d04307e644c4623d52b36613cc11267fca8ce8ebd52b5878497f2b37d896e' 
  AND token = '+rQYvfxcP790jBUXlHXD+uKWlHwHNSn451VeY87u0SA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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