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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da43f9c967008d710781efb8d9e2c32ab3ec9a88f38d7856def5e6800ed45ade' 
  AND token = 'bvLEz7SRh/Pqkq6SqZ0i8nn+8iO0XfhIBWzVdPHSUlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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