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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0364a9e478ded199394d89b2e42fd31a647e983b011f21b0bfef5e98e0f487b' 
  AND token = 'vNZfV01n5Mg/Nu9IscrO5be/O8oqL7H2okzzj4SGMms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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