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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb9535d1862ccde6c9106df2152559890f009dd651c9fcb7e8c784c8bbc7385d' 
  AND token = 'vP+boPVfy56Cn2UNVI8cv/yZJ45LLKLhRxXoT5o7OtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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