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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb4832ba7394f0168212c0fa0f0445ae215f2b8edc9f90d2d7bb80a4cb0b38f8' 
  AND token = 'yjDen4WpS8zCBvdIECKZ5/AMrCtHpqE+hR4GCDyn5Fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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