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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af73ed975c87d4976eff2ea530a958e420aefaaaa2f77f57a46f0c68bac4a016' 
  AND token = '2YpA4Mp2cpeBEB7TvGFQJXlCAT9XuInIO7chojH4rwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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