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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd70485bf31bffb99705133684562cb695168ed5e2c9a67e2fd499d2eaf13eb55' 
  AND token = '5zJY41boD4RFnapNOhSb2YIgD9nfWpW9mrlTnYynoX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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