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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba92ff94c3e244cf1130c8b1cfe713a7513978bc8e9a58973b97afe31fb728bf' 
  AND token = 'onkga50RuwLzAsG+R5dmkNMK8JUIbMJi3ApsYpgVI7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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