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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '184366d740d4819a0b9791a4be34c75aae7c0ef27dd9bd8103e154d71598ba8f' 
  AND token = 'R783DZcdzcjMRI14Tu77O9KWuhmHhqt290xJqpHobYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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