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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eb7ca006f0a01a132be66bb6dcd942a9997799a41cb911164e0d93de4d83e16' 
  AND token = '4AaKX5y+42b23Z+LQK0AQKsqk3zGRKrqhVfY2Zoa85w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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