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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b6eead64c54a519946cd4a9fe734d680fd35ce74a387369e92c7aca4bf9a4f1' 
  AND token = 'ViC0ViQ241FpBriJdlSrJ8hV73FR/jx74oTwqs/AyZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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