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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c24a46df71e68606874275ba4e1d9d4afa58c5565c10d3646e71d0a35fd90ce3' 
  AND token = 'v5zrm49GBKD/fXfPQkeGCvnKmFEbAVWjv18mlMisSxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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