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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05e32d5858edb035e410f736f1edb14c79d4c09d34230c9609418f36b76f2e49' 
  AND token = '2TdmXk1xO3Xf0FFgWS6piqSTjwM75u4K94YYCrivIJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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