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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74edeea51ffd242fff4a7e42a30ed37648ccf4f928a2e32e253ffd6e0243ce6e' 
  AND token = 'lXwolrrWzlrKvIAqLNlhHZUNs/hmOD4Ll42sqBSAFr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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