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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa41f3d52506f81ed20c0bbb8184d53db492f0d5134cebf1aa7501d94770f1e3' 
  AND token = 'sf5cDsuzy2cmZ99sn1KGCsR7EySBWNZfF+m3xH1l8FQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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