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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f018641b65b489e436b3122791c6a5058206cda52b08fcdc980a5956f5f417b5' 
  AND token = 'UKUP+Z6fiHKbwkTg6k2eAuBVhnZ5eNEsqfAu2ucwSzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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