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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aa5d92725764cc098b09c9452fa72b246aad42ea297638c7097a2d26d388aa4' 
  AND token = 'qvqyoabpqoAq/RdWoTWrP9i8nMzvccBzm4lIxQJs08A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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