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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1804b49898a079ce890669361ca27e7f466c2d8954c61ed1090123e0df61c33' 
  AND token = 'KV7fNNjTlDVAF00Dii09Fh0Wa+i/5jencN/cxCjD7mE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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