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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3832ee69480bc46ef5054943687db880d8999b5edc1a7a3f453a06cf475e5462' 
  AND token = 'tFRRBPIfUo3CoiygD0LGJYTP2a3fZ6/3g+yX8rXhjCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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