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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a6194b8d7f2c28b386cc4b6a5ca8d2e2d0a8d22c1274ae2afbca77bc3168f77' 
  AND token = 'lYPqKNKH0ECHvx2Qbbi/JMqZwPGWCrKSplpUonqRF6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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