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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eaf9e8b013936a8e6016d23193640b11a00db28772cd547080f9e9fd9d17fb0' 
  AND token = '4ydyb6ujHNEti3GkhX6FQ7gLKiSd0XPRl+3C+IdtlQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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