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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '719a438ae0dcf568fd9847cdbde5f45a3ad03c3cb32aff9f23ace7e73e327ae2' 
  AND token = 'R7Caq19UmFZg9J6fYJlu9vG3JWii9bJmdgSj0dh5yzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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