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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6ab4859a66c430fc81a2e72cdf1e23f00b84613ed28ccd8d15413db0d962c99' 
  AND token = 'SHN9FVdl+lFUxr8u9Z0STn8DfulZrV+9/Ji3m+bwgYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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