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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecc2d9b5a907771026e93cf358a92d5c366884836c51b94e752981cd97c2b12c' 
  AND token = 'PhO0H14d6/9rzYkfBbAf8teDPZ+Kqv94Ph8UbdptMt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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