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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6365f169775a3c525d8181f50d011b82395121f2129a2e3da2a173ba59c5f1f' 
  AND token = '0a9mKz3bQfTj2qbYkl0180sO81HIBUdjBGATzua4yvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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