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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a873c854cc1119b1e71dd0323629fcf8cd94a14acb09b07c27e320af5430a62d' 
  AND token = 'DY+DbOteqz3SAwupGM7eNNeXt0ARcNncXIfdPfozc/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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