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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9bf7a0bf7d26a23701afa722287fa19b2d31479f266005c2be49caa55f9a4a5' 
  AND token = 'hTiiqD9gxTt5VPkpcmDkT6gf0bvohMDTJHQVic0dYvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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