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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6976c2e3d501a07c63f68ddb9ad33354466afd3971410e863fa86f32318612bb' 
  AND token = 'FEoOYs3Sn6wPF1L8pcF0MG+Lt6A92lih21/67/R2Agw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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