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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6b9d51227411040be683b69f2914e45fc06cc3560396f18a10b4cbc6d00ef7e' 
  AND token = '0nHt2lGNvff8ogv2ZbL7yIYUf1iQMhVOQHLptrRivts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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