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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '560edb5942fb16b9c1e0e2213464b9063999341573b81111af248aea421e3818' 
  AND token = '/JxfqyMrqQxBUb3lUpP9uG1WEpN2R5AjbSD27dUZgks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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