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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e1163ac547ae3db26683afa7a559e0f65aae0095a993b4be90c1468010a8651' 
  AND token = 'UJajCYDhrrIQi7yDHwHVM4SJY9d3neOy4l63rJS92iQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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