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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4c1a5dc7c25e3f4c789f2393035c4928c562e49585dca06a3067577135ab78c' 
  AND token = '3YIGgEOT1Bt9meiP57vDGcH6Q9MURZ0WzkINYKTfUKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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