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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21ef6472c5f50681874db2b1ef9d539faee30fb817e68cc83e2a94980514f7d3' 
  AND token = 'Ra2FrOvhDOX0uhEojJLNdFwNvi6jZhIfc40ewNG4R1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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