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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44a8517de3c99f38cfd6ed92b08384ca823b75e03249af5f7c9ce4ea4ca46dfb' 
  AND token = 'sqyaoXubu8miSJnb4yYQTJSPvEJ9WXDCI5PbJW2JPxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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