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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dad4ef9c77271e7fa732e96fa45578a83631c901d985c6becafe4c34f642652f' 
  AND token = 'kbQTkkGczZ13KB25OkjX9SvEXMhpr93vxLiOJ+oe0BQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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