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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd1a1100038d5b1503530587d0432d19df73c0145ab2c6a1e9ef388f50d91e84' 
  AND token = 'Yr+nuX2y379pVnS2jiWDQSWnbWi1Ky4rijN/5viaU8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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