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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38603dd7d74af1e707ea4e252b50e9f520e7d3b0245fbdb3c895b77b3240b5f6' 
  AND token = 'VcTN3tOYxzVkRhagRjUqfiFXKqEHEe/MWJWvTUMPwbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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