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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84d9a4fea0235ce7eda505157597c66045848d696ba83c1562f287b956b8ba61' 
  AND token = 'eHbbfGbDEuyBcwmTJjndiQb/pZniEv+i3VHT8ukHnVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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