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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36ff052b3b0da1a82717107a4c861bd52f320249193efa9ca7d3874fa7e9e167' 
  AND token = 'WhuiVJla7Q3Fc2nVZmSYip6nJ5qM3/p8nHpLDiO7qh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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