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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7faa0e830cc5c4b62a8bc47169e24ce1cbc02ea28ff976bbbaf6e66cf8028989' 
  AND token = '3CEjp0YLpapYPB28D0ixZIvMuQc5dDeithti2rZHPPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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