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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90a222d84f5306e4f2734e3865717d3707dc30224cc72e4662d9ba94b3708618' 
  AND token = 'i8bp82G6U4AeGMrQvBTYXumclo61xxMHqItCMjSbfXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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