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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12463e0f24f3035cbc400d762da2cd1a02ebf2fdaaf2294c0407a485c5a4a114' 
  AND token = 'XC1i9MgDCFKpRdC5y9viXjCR05thMIxcobkGP0pDLbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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