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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b98e7db2fd32cdc642f8ed914c23245383a7925a104fa24abdb849b9458b96a' 
  AND token = 'V7guM9LyArv8aUPJSBXuCx+ez229pGv94GgkX+S/mys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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