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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83cb7d3c59c5e04d90cc29e3e4fa1c7f991b15e5a7b76a7fd9af63e8c4332b4a' 
  AND token = 'gRlUgCKiRQdwiCNwUM4F2po8iwhqDN0nPvF5MSTufrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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