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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c669826fdee10dc7af56f4faa6482149a703503bcff942a13926f48906744717' 
  AND token = '77/voVP0SHtbPIIkfK84385wbuCcUZGAuaabfYlKtiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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