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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '985076f4c8ff95f087606434595a27d6b06a3b97e0251fe39a3baa519cb07e9a' 
  AND token = '+fKN38ZMDMFL/I9bltmDT+cAM0au9DlWVwrVfziFad0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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