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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d3260aede9f8826c1e85da034fc19b31c4829606da8a7cdb4894c35a3e6f477' 
  AND token = 'e021dCoLaExvOB7YwAKzy+6qQ0D1z2yj+0DzS5ebPo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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