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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0083c03740ad70ff452c909381d81f7d7aa322e6bc025c80e944e3322b690b10' 
  AND token = 'UycJYxr1wOSjxAdP1dxQdNJW1Y52vMnjD2nSXgRPv4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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