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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56819f0d0d0bf61b6bfe4255814f12c77e7bdd6e771b70ae46515696b3048d96' 
  AND token = 'XqR3EraJDxijwO+iH8QhvNOgiS9G2TiwPejRKna94c4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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