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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '496b35f62c22d7f782733f04b8f7927717a7260195a7d0cb895afef838d83ba5' 
  AND token = 'Np89usOY68dv+05OfahL1NSoW6ZlUtHpx3JFbfz2eGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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