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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '829ba3c1cabafb19608d91863513b1deb1dec673fc50ac1f1e0439c3ce0ef009' 
  AND token = 'CssId62H4BWCOs0TsY1PCOB9kAGJD1sCC7n63Qo7eyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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