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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93d5da6e3d3cedf6bd54fed39388acad4b9d4d464bfc5c9e93f86c28d83121ed' 
  AND token = 'zgJmumDhTJ/E8pRlukLgYwnToR2PZ4YGveDWoX4B/s4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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