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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a52a090b7267465a3d0af4c7ef79f1f02707715ec0ce1d903a4dff3c84eeaa55' 
  AND token = '0C3AkEGAzjGtbQHIN5smZPWz88j+hcTrW16J573rGss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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