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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23de3cd5c03166a74c9dff21acf10ce23ebce9b8c8159a9acc93ab1b76b59388' 
  AND token = '4wc3lGxrd+31YUeoEKAoat379Wwc9UHuWOd0POERvxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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