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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c7a98cd9d7c99c5c6cd22213feaf69f672d00e53c4d97e19a99f1f1679cfbf9' 
  AND token = '/OdH1oEjI8rIlGysCCkUfLweLfPQJ0bSfD/PA6vzNYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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