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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8e70eea66a6a63be4d7a9d887b8e538d5b3b1e0c6b1cf7ca0f3e360ffff1b79' 
  AND token = 'zhVkx2MiQz97H/ZCa0kgB9yRVLksuq5TIw8+k2JmxHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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