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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdd35838cd4e865bfd7d979faeb8e3f1c9bd4ce337906e77463a39d38d0d5697' 
  AND token = 'D1LMUofZwti2XsX47Rs/NDXQ4jsl1Fl9BtPZOTIXqcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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