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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '015cac9bb6ed9fe06314387a3b161513bcd1cfa08602d33b7c682e668434a5aa' 
  AND token = '6n5PXQDd5A4yG4rAMyMTvnU018aBBvtG8nJ2Nbc/FnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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