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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32de066a2575ba036226cd1563045431cf9a770570f101de601c18fd5787d5c4' 
  AND token = 'm6/8ft1hSfLZjXt5xsI3ZR+C73k2QnBmsbodZ4Vfgbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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