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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '898931bf057d38b88444557246e78cedbb1d1dde9e20f1f830134792d0390f79' 
  AND token = 'LggqvmhCoTvk7MwEAJcvSMravoNlNxEeY3nY8XnTbHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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