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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4174d94b46aeada78a8666354ac5a167e89c10a11e16d603dba58f67e5ee901' 
  AND token = 'd5+O0x4gba/blCDiPsR2y693iq9Ag0duB8CUJ6a9w0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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