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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac8a7117d177b4342ffbbb8a646031df633fafd56fb24e0d9179835e5c33e51f' 
  AND token = 'mpkHijPzHpRGcaaaN3RArH47fwkGo16QCVkqai+x8i0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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